import Mock from 'mockjs';

const formatParam = url => {
	let param = {};
	url.replace(/([^?&]+)=([^?&]+)/g, function(s, v, k) {
		const val = decodeURIComponent(k);
		const num = Number(val);
		if (isNaN(num)) {
			param[v] = val;
		} else {
			param[v] = num;
		}
		return k + '=' + v;
	});
	return param;
};

const modulesFiles = require.context('./modules', true, /\.js$/);

const mocks = modulesFiles.keys().reduce((modules, modulePath) => {
	// set './app.js' => 'app'
	const context = modulesFiles(modulePath).default;
	return [...modules, ...context];
}, []);

// const mocks = [...medicine];

// for front mock
// please use it cautiously, it will redefine XMLHttpRequest,
// which will cause many of your third-party libraries to be invalidated(like progress event).
export function mock() {
	// mock patch
	// https://github.com/nuysoft/Mock/issues/300
	Mock.XHR.prototype.proxy_send = Mock.XHR.prototype.send;
	Mock.XHR.prototype.send = function() {
		if (this.custom.xhr) {
			this.custom.xhr.withCredentials = this.withCredentials || false;

			if (this.responseType) {
				this.custom.xhr.responseType = this.responseType;
			}
		}
		this.proxy_send(...arguments);
	};

	function XHR2ExpressReqWrap(respond) {
		return function(options) {
			let result = null;
			if (respond instanceof Function) {
				const { body, type, url } = options;
				// https://expressjs.com/en/4x/api.html#req
				result = respond({
					method: type,
					body: JSON.parse(body),
					query: formatParam(url)
				});
			} else {
				result = respond;
			}
			return Mock.mock(result);
		};
	}

	for (const i of mocks) {
		Mock.mock(
			new RegExp(i.url),
			i.type || 'get',
			XHR2ExpressReqWrap(i.response)
		);
	}
}

export default mocks;
